... 4) Japan 6-gear derailleur Popular Electric bicycle with EN15194Motor of electric bicycleRear drive, 250W, brushless, hub, ... high efficiency and durable)Battery of electric bicyclelithium, 36V / 10AhDerailleur of electric bicycleMade-in-Japan, Shimano, outer ... 7 gears,precise and reliable shiftingFrame of electric bicycleAluminum alloyRims of electric bicycleDouble-wall, alloy, Stainless steel spokes ...